[DISC] Fix Mqtt Device Trigger announcement message (#2091)

main/ZmqttDiscovery.ino

@@ -130,7 +130,7 @@ void announceDeviceTrigger(bool use_gateway_info, char* topic, char* type, char*
     strcat(state_topic, gateway_name);
 
     strcat(state_topic, topic);
-    sensor["topic"] = state_topic;
+    sensor["info_topic"] = state_topic;
   }
 
   /* Set The Devices */
@@ -187,7 +187,7 @@ void announceDeviceTrigger(bool use_gateway_info, char* topic, char* type, char*
   sensor["device"] = device; //device representing the board
 
   /* Publish on the topic */
-  String topic_to_publish = String(discovery_prefix) + "/device_automation/" + String(unique_id) + "/config";
+  String topic_to_publish = String(discovery_prefix) + "/device_automation/" + String(Gateway_Short_Name) + "/" + String(unique_id) + "/config";
   Log.trace(F("Announce Device Trigger  %s" CR), topic_to_publish.c_str());
   sensor["topic"] = topic_to_publish;
   sensor["retain"] = true;

main/main.ino

@@ -585,7 +585,17 @@ bool pub(JsonObject& data) {
     data.remove("origin");
   } else if (data.containsKey("topic") && data["topic"].is<const char*>()) {
     topic = data["topic"].as<const char*>();
-    data.remove("topic");
+    if (data.containsKey("info_topic") && data["info_topic"].is<const char*>()) {
+      // Sometimes it is necessary to provide information about the publishing topic, not just use it.
+      // This is the case, for example, for the RF2MQTT device trigger announcement message where the
+      // temporary variable info_topic provides information about the topic that will be used to publish the message,
+      // and it can be different of current message topic (This is a clever pun, I hope it's clear).
+      data["topic"].set(data["info_topic"]);
+      data.remove("info_topic");
+    } else {
+      data.remove("topic");
+    }
+
   } else {
     Log.error(F("No topic or origin in JSON, not published" CR));
     gatewayState = GatewayState::ERROR;